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Interest-Bearing Liabilities - Summary of Notes, Bonds, Bilateral Loans and Committed Credit (Detail) € in Millions, kr in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 SEK (kr) | Dec. 31, 2024 EUR (€) | Dec. 31, 2024 USD ($) | Dec. 31, 2023 SEK (kr)
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | kr 38,041 |  |  | kr 46,873
Notes and bond loans [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 23,188 |  |  | 26,888
Changes in fair value due to changes in credit risk 2024 | 401 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 515 |  |  |
Notes and bond loans [Member] | Mar 1, 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | € |  | € 500 |  |
Coupon | 1.875% | 1.875% | 1.875% |
Currency | EUR |  |  |
Maturity date | Mar 1, 2024 |  |  |
Interest-bearing liabilities | kr 0 |  |  | 5,523
Changes in fair value due to changes in credit risk 2024 | (13) |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 0 |  |  |
Notes and bond loans [Member] | Dec 22, 2025 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | $ 150 |
Coupon | 2.741% | 2.741% | 2.741% |
Currency | USD |  |  |
Maturity date | Dec 22, 2025 |  |  |
Interest-bearing liabilities | kr 1,611 |  |  | 1,416
Changes in fair value due to changes in credit risk 2024 | (3) |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 24 |  |  |
Notes and bond loans [Member] | Dec 30, 2030 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | $ 200 |
Coupon | 3.02% | 3.02% | 3.02% |
Currency | USD |  |  |
Maturity date | Dec 30, 2030 |  |  |
Interest-bearing liabilities | kr 1,918 |  |  | 1,736
Changes in fair value due to changes in credit risk 2024 | 33 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 120 |  |  |
Notes and bond loans [Member] | May 26, 2029 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | € |  | € 500 |  |
Coupon | 1.00% | 1.00% | 1.00% |
Currency | EUR |  |  |
Maturity date | May 26, 2029 |  |  |
Interest-bearing liabilities | kr 5,222 |  |  | 4,701
Changes in fair value due to changes in credit risk 2024 | 189 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 37 |  |  |
Notes and bond loans [Member] | Feb 8, 2027 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | € |  | € 750 |  |
Coupon | 1.125% | 1.125% | 1.125% |
Currency | EUR |  |  |
Maturity date | Feb 8, 2027 |  |  |
Interest-bearing liabilities | kr 8,314 |  |  | 7,714
Changes in fair value due to changes in credit risk 2024 | 79 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 77 |  |  |
Notes and bond loans [Member] | May 29, 2028 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | € |  | € 500 |  |
Coupon | 5.375% | 5.375% | 5.375% |
Currency | EUR |  |  |
Maturity date | May 29, 2028 |  |  |
Interest-bearing liabilities | kr 6,123 |  |  | 5,798
Changes in fair value due to changes in credit risk 2024 | 116 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | 257 |  |  |
Bilateral Loans And Syndicated Loans [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 12,514 |  |  | 15,133
Changes in fair value due to changes in credit risk 2024 | 166 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 120 |  |  |
Bilateral Loans And Syndicated Loans [Member] | July 31, 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | $ 281 |
Currency | USD |  |  |
Maturity date | July 31, 2024 |  |  |
Interest-bearing liabilities | kr 0 |  |  | 2,829
Changes in fair value due to changes in credit risk 2024 | (11) |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 0 |  |  |
Bilateral Loans And Syndicated Loans [Member] | Dec 18, 2025 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | 150 |
Currency | USD |  |  |
Maturity date | Dec 18, 2025 |  |  |
Interest-bearing liabilities | kr 1,664 |  |  | 1,509
Changes in fair value due to changes in credit risk 2024 | 7 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 15 |  |  |
Bilateral Loans And Syndicated Loans [Member] | Jun 21, 2028 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | 305 |
Currency | USD |  |  |
Maturity date | Jun 21, 2028 |  |  |
Interest-bearing liabilities | kr 3,329 |  |  | 2,976
Changes in fair value due to changes in credit risk 2024 | 53 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr (23) |  |  |
Bilateral Loans And Syndicated Loans [Member] | Dec 16, 2030 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | 107 |
Currency | USD |  |  |
Maturity date | Dec 16, 2030 |  |  |
Interest-bearing liabilities | kr 1,223 |  |  | 1,097
Changes in fair value due to changes in credit risk 2024 | 20 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 49 |  |  |
Bilateral Loans And Syndicated Loans [Member] | Dec 18, 2030 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | 273 |
Currency | USD |  |  |
Maturity date | Dec 18, 2030 |  |  |
Interest-bearing liabilities | kr 3,041 |  |  | 2,718
Changes in fair value due to changes in credit risk 2024 | 55 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 37 |  |  |
Bilateral Loans And Syndicated Loans [Member] | Aug 30, 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | 200 |
Currency | USD |  |  |
Maturity date | Aug 30, 2024 |  |  |
Interest-bearing liabilities | kr 0 |  |  | 2,002
Changes in fair value due to changes in credit risk 2024 | 0 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 0 |  |  |
Bilateral Loans And Syndicated Loans [Member] | Feb 29, 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | $ |  |  | $ 200 |
Currency | USD |  |  |
Maturity date | Feb 29, 2024 |  |  |
Interest-bearing liabilities | kr 0 |  |  | 2,002
Changes in fair value due to changes in credit risk 2024 | 0 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | 0 |  |  |
Bilateral Loans And Syndicated Loans [Member] | Feb 15 2031 [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | kr 184 |  |  |
Currency | USD |  |  |
Maturity date | Feb 15, 2031 |  |  |
Interest-bearing liabilities | kr 2,050 |  |  | 0
Changes in fair value due to changes in credit risk 2024 | 23 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | 23 |  |  |
Bilateral Loans And Syndicated Loans [Member] | July 14 2031 [Member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | kr 108 |  |  |
Currency | USD |  |  |
Maturity date | July 14, 2031 |  |  |
Interest-bearing liabilities | kr 1,207 |  |  | 0
Changes in fair value due to changes in credit risk 2024 | 19 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | 19 |  |  |
Commercial papers [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Interest-bearing liabilities | 1,607 |  |  | 2,014
Changes in fair value due to changes in credit risk 2024 | 0 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | 0 |  |  |
Commercial papers [member] | Feb - Mar 2024 [member] |  |  |  |
Disclosure Of Borrowings [Line Items] |  |  |  |
Nominal amount | kr 1,615 |  |  |
Currency | SEK |  |  |
Maturity date | Feb–Mar 2025 |  |  |
Interest-bearing liabilities | kr 1,607 |  |  | kr 2,014
Changes in fair value due to changes in credit risk 2024 | 0 |  |  |
Cumulative changes in fair value due to changes in credit risk 2024 | kr 0 |  |  |

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